1) Usually we finish billing your account by the 5th of every month. An email with the information on the credits usage for the previous month is sent to all the admins of the account. (Ex: March invoice would contain the usage of February as our billing works in a way where we account for the usage of the current month by the 1st of the following month)
Please note that if you have a prepaid bill plan, this is merely a usage summary and is not a request to make the payment.
If you're logged into your account, click on the Buy Credits button in the top right corner.
Click on Bills in the left panel. You will find a list of all your previous bills here.
3) You will receive an email acknowledgement immediately every time you made an online payment. Currently, we do not send any automated acknowledgement if you make a payment by other modes(IMPS, NEFT, or RTGS).